Flying hot saw



Feb. 25, 1947. R. STEVENS EI'AL 2,4 ,6

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Feb. 25, 1947. R. H. STEVENS ET AL FLYING HOT SAW Filed Nov. 13, 1942 14Sheets-Sheet 2 Elma/um ESh'aens H v .andLZom 11 229022,

Fb. 25, 1947. STEVENS ET AL 2,416,653

FLYING HOT SAW Fild Nov. 13, 15242 '14 Sheets-Sheet 4 mama ask-vans azulTam I Feb. 25, 1947. Rrg-r. STEVENS ETAL 5,

' ELY-INQ- HOT SAW Filed Ndv. 15, 1942 14 Sheets-Sheet 5 and Tam z'lsan.

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R. H. STEVENS ETAL FLYING HOT SAW Filed Nov". 13; 1942 l4 Sheets-Sheet'7 Feb. 25, 1947. v R. H. STEVENS ETAL 2,416,653

. FLYI-NG HOT sAW FiledNo v. 13, 1942 14 Sheets-Sheet 8 12a 121 1Z0 Z3 11; I 1 2! .92 124 120 .1" 61' 173 11912,? J29 1:3

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R. H. STEVENS ET AL FLYING HOT 84W Filed Nov. 15, 1942 14 Sheets-Sheet 9dlzShuelas and T0m 11 129010.

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R H. STEVENS ET AL 2,416,653

FLYING HOT SAW Filed Nov. 13, 1942 14 She e-ts-Sheet 10 kdfiardflSlevmsand Jm'n 11 221501.

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Feb. 25,1947. R. H. STE VENS ETALQ FLYING HOT SAW Fil ed NovglS, 1942 14Sheets-Sheet 12 KEEN NQN

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FLYING HOT SAW 1 0 110 13% v 49 I fielaiive'fl'ar'm0lnal Speeds.arazzafsm. a +ax.Jz;sm-.-3 a 3 Stevens Patented Feb.

NT OFFICE FLYING nor -saw Richard H. Stevens and Tom Wilson,

Baltimore,

Md., asslgnors to Bethlehem Steel Company, a corporation of PennsylvaniaApplication November 13,- 1942, Serial No. 465,470

30 Claims. (CI. 29-69) This invention relates to apparatus forautomatically severing rapidly moving objects such as pipes, rods andthe like into predetermined lengths and is more especially designed foruse with a continuous butt weld pipe mill. In pipe mills of this typethe skelp when it comes from the rolling mill is in .large coils. Thesecoils are fed rapidly in succession to a machine which uncoils the skelpand straightens it and then it is advanced in a ribbon like form on arun out table or floor of the mill to form a long loop or a series ofloops. The skelp is then passed through a furnace where it is heated toa welding tem-- perature. As it issues from the heating furnace it isdrawn through a bell or forming rolls, then between welding and sizingrolls,'and while still hot and moving rapidly is out by a flying sawinto commercial lengths. The cut lengths are then passed betweendescaling rolls, and lastly transferred to a'cooling bed.- After a coilof skelp has been fed in this manner the next coil is placed in themachine for uncoiling. As this coil is'fed to the run out table the cropends of the rear end for the fed coil and the forward'end of the coil tobe fed are cut on and the two ends welded together. These operations arerepeated and the skelp and pipe formed therefrom are advancedcontinuously at high speed.

In one well known and often used type of flying saw, a guide or troughsupports the moving pipe in a fixed position with reference to the sawcarriage, while the motor and saw are tilted laterally thereof on areciprocating saw carriage to cut the pipe.

This type of saw in operation, however, has several disadvantages. Ifthe pipe is traveling at a speed of 500 feet or more a minute as is thecase in forming the smaller sized pipe and is being cut into 20 footlengths, the saw must make a cut in less than every two and one halfseconds. To trip the weight of the saw and motor at this high speedcauses excessive wear on the carriage and to eliminate this conditionthe mill has to be slowed down, thus reducing the tonnage produced, orelse an undue amount of valuable time and labor must be expected to bewasted in frequent shutdowns for repairs.

One of the objects of our invention relates to the mechanism forautomatically swinging the pipe into cutting engagement with the saw.during a reciprocating stroke of the saw carriage.

Another object of our invention relates generally to apparatus forcutting into predetermined lengths continuously moving pipe andparticuin the appended claims.

. 2 larly to means for synchronizing the movement of a pipe severingdevice with the moving pipe.

Another object of our invention relates to means which can be preset toindicate the travel of the pipe' in feet and inches per minute.

Another object of our invention relates to mechanism which can be presetto automatically cut a plurality of pipe sections of uniform lengths. I7

Another object of our invention relates to mechanism by means of whichpipe sections of different lengths can be automatically out.

Another object of our invention relates to the means for adjusting thestroke of the saw carriage.

Another object of our invention is to provide a lost motion devicebetween the rocking lever and the motorfor adjusting its stroke.

With the foregoing and other objects in view, the invention will be morefully described hereinafter, and will be more particularly pointed outReferring now to the accompanying fourteen sheets of drawing which forma part of this specification and on which like characters of referenceindicate like parts.

Figure 1 is a top plan view of a pipe severing device embodying ourinventio' Fig. 2 is a front elevation thereof.

Fig. 3 is a rear elevation ofthe saw carriage supporting frame drawn ona larger scale with parts in section showing the arrangement of the camoperating device, for actuating the cam lever to throw the pipe into orout of cutting engagement with the saw.

Fig. 4 is a detail in top plan showing the mill motor and the last setsof sizing rolls for advancing the pipe past the saw carriage.

Fig. 5 is a vertical transverse section through the saw carriage andframe taken on the line 55 of Fig 2. I Fig. 6 is a detail of thecarriage drive mechanism with parts in section. taken substantially onthe line 66 of Fig. 2 to show more clearly the planetary gears for con-Fig. is a vertical section through the saw carriage taken on the lineIll-'40 of Fig. 2.

Fig. 11 is a detail section taken on the line :||-u of Fig. 5.

Fig. 12 is a vertical longitudinal section through the rocking lever.taken on the line |2-|2 of I Fig. 13.

Fig. 13 is a vertical longitudinal section through 1 the rocking levertaken on the line |3- |3 of Fig.

Fig. 15 is a detail view of the constant drag brake taken on the line|5|5 of Fig. 13;

Fig. 16 isa detail view showing the jaws ofa Fig. 13.

Fig. 1'7 is a diagram of the electrical control circuits for thesequence operation which will determine the number of reciprocations ofthe saw carriage per cut of pipe section.

Fig. -18 is a diagram of the electrical control circuits for producing auniform action saw carof the stub shaft for the planetary moving pinionand the horizontal movement in per 5 intervals of the crank oreccentrically disposed portion.

Fig. 22 is a diagram showing the relative horizontal speeds of the crankor eccentrically disposed portion of the stub shaft during thereciprocation of the saw carriage. I

--Fig. 23 is a front elevation of the dial indicator device.

Fig. 24 is a vertical longitudinal section of the same taken on the line24-24 of Fig. 23 and Fig. 2515 a detail section showing the drivinggears for the dial indicator taken on the line 25-25 of Fig. 24. p f

Referring now to the various characters of reference on the drawings,the numeral indicates the moving pipe to be cut, 2 the sizing rolls,

14 is. a transverse section through the v rocking lever taken on theline |4--|4 of Fig. 12.

lost motion device taken on the line 16-46 ofnaled in bearings 4| and42.

The stub shaft 23 has an outwardly extending crank portion 28 which iseccentrlcally disposed in relation to the main body of the stub shaftand is provided with a roller bearing 29 thereon I for pivoting one endof a connecting rod 36 that extends to the rocking lever 3| and pivotedthereto in a relatively fixed position by a bolt or shaft 32. Thisrockin lever 3| has a hollow outer casing 33 in which is journaled aspindle 34 having a beveled gear 35 secured to its lower end and itsupper portion threaded as at 36 for engagillg an adjustable block 31mounted in a slideway' 38. .Th lower end of the rocking lever isprovided with trunnion projections 39 and 40 jour- Journaled in thelower end of the rocking lever 3| is a shaft 43 having a beveled pinion44 secured thereto for meshing with the beveled gear 35 on the lower endof the spindle 34. through the central portion of the trunnion 40 andhas a brake disk 45 for a brake band 46 which is connected to thejournal bearing 42 by means of' a pin 41 and is adaped to produce aconstant drag on the brake disk 45.- The brake disk 45 is alsoprovided'with a pair f jaws 48 for engaging a similar pair of jaws .49extending from a brake disk 58 for a friction brake secured to the shaft5 of the motor 4. The jaws 48 and 49 are spaced far enough apart toallow the rockinglever 3| to swing its maximum stroke and form, a lostmotion device during the normal 3 the mill motor for rotating theforming and,

sizing rolls to advance the pipe, 4 the motor for adjusting the block inthe rocking lever and 5 the motor for reciprocating the saw carriage andthe cam operating devices for actuating the movable trough V6, to throwthe pipe I into cutting tie generator "I and tachometer The shaft 1*journaled in the gear casing 8 is provided with a .worm |2 meshing witha worm wheel |3 which is keyed to a rotating tubular shaft l4 journaledin roller bearings i5 and I6 in the'gear casing 8. A

fixed shaft |1 extends through the tubular shaft l4 and is keyed at oneendas at l8 to the cap |9 for the roller bearing I5 and supported nearits opposite end in a roller bearing 28 and extends beyond the same andhas a gear 2| keyed thereto meshing with a pinion 22 mounted forplanetary movement around the gear 2| on a stub -shaft 23 journaled inroller bearings 24 and 25 of the casin for gear 2| and the pinion 22,which has its inner cup shaped portion 26, formed integral with thetubular shaft l4 and an outer cover portion 21 attached thereto.

reciprocation of the saw carriage 51.

When it is desired to adjust the stroke of the 'saw carriage 51the.m0t0r will rotate the'brake disks 50 and 45 and shaft 43 therebyrotating beveled pinion 44, beveled gear 35 and spindle 34 to raise orlower the adjustable block 31 depending upon which way the shaft 5| ofthe motor 4 is rotating.

The adjustable block+31 has trunnions 52 extending from its oppositesides that project through vertically extending openings 53 in theadjacent sides of the casing 33 of the rocking lever 3| which are closedby sliding cover plates 54. The trunnions 52 are pivoted in journalbearings in a bifurcated end of a, pitman rod 55 that has its other endpivoted as at 56 to the frame of the reciprocating saw carriage 51.

The saw carriage 51 comprises a rectangular frame 58 provided with atable 59 for supporting a motor 60 for rotating a saw 6|. Therectangular frame 58 has top and bottom members of inverted V-shape eachhaving a pair of rollers 62 journaled thereon at their opposite ends,each pair of the rollers being disposed at an angle of 45 to each otherand mounted to reciprocate the carriage on track bars 63 which aresquare in cross section and supported bythe stationary end frames 64mounted on a base 65.

In order to actuate the limit switch that controls circuits for thesequence operation, which will determine the number of reciprocations ofthe saw carriage per cut. a beveled gear 66 is keyed to the intermediateportion of the tubular shaft M which meshes with a similar beveled gear61 secured to a shaft 68 mounted in a pair of journal bearings 69 and 18in the gear casing 8. The shaft 68 extends outwardly beyond the sidewall of the gearcasing and is coupled to a longitudinally extendingshaft 1| which in turn is coupled to and rotates a cam shaft 12 andggnnecting shaft 13 extending to the limit switch In operation the sawcarriage is adapted to reciprocate continuously with the saw motor andThe shaft 43 extends saw 6| mounted thereon to travelwith the carriagebut in fixed relation thereto while the trough 6 is adapted to swingthe-pipe I into 59 of the saw carriage spaced downwardly extendingplates III and III.

e is provided with a, pair of The plate I" is provided with a pair ofspaced forations by a web plate I9. Pedestal supports 88 are mounted onthe top wall 18 at opposite ends of the frame member provided withjournal bear- 8s III and 82 for suppo ng the cam shaft I2 and thepivoted ends 88 of 34 for a cam lever 86. flat plate portion 86 providedat its outer end with a rib 81 and a seat 88 for a cam 89 adapted toengage a cam roller 90 journaled in the lower end of a pivoted swingingarm 9| which has a bracket 92 at its upper end for supporting themovable trough 6 for receiving the pipe I. A pair of spaced lever arms93 are'secured centrally to the tubular support 04 for the cam leverprovided with a cam roller 94 at their upper ends for engaging a cam 95mounted on the cam shaft 12, and at their lower ends which extend belowthe tubular support 84' with a pawl 96 for engaging a latch 91 which ispivoted as at 98 to the magnet 99 of a solenoid I00 mounted on thebottom wall 11 of the vframe lmember I5. The latch 91 is, pivoted at anintermediate point as at IM to an ear extending from the under side ofthe top the tubular support wall I6 of the frame member and a bracketI02 is mounted above the same on the topof the wall 16 for supportingthe upper end of an eye :The cam lever has a .bolt :03 having its lowerend pivoted as at m' to the outer end of the latch 91 which is normallyprojected downwardly by means of a spring I05 which surrounds the eyebolt between the upper flanged portion I06 of the bracket I02 and a nutI01 on the eye bolt. 8

Asillustrated in Fig. 5 the parts are indicated in full lines in theposition they would assume for the cutting operation and in dotted linesthe v position they would assume normally when the solenoid I00 isdeenergized. Normally when the solenoid I00 is deenergized the pawl 96will en age the latch 91 and cam lever 85 and the parts movabletherewith will be held as indicated in the dotted line position;

When it is desired to cut the moving-pipe during a reciprocation of thecarriage the solenoid I00 is energized thereby disengaging the latch 91fromthe pawl 96. The cam lever 85 then has to be raised to bring the cam89 into alignment with the cam roller 90. To accomplish this an ear I08is secured to the under side of the intermediate portion of the flatplate and is pivoted as at I09 to the of a bolt IIO with its lowercylindrical casings I I I and clevised upper end H2 and having acompression spring II3 thereon. The lower cas-- ing I I2 is fixed andwelded to the bottom wall 11 oi the frame member 15, while the uppercasing III is slidable thereon and is normally limited in its upwardmovement by nuts II4 threaded on the bolt I I0. In order to limit theupward movement of the cam lever-85 a stop plate H5 is provided havingits ends supported in brackets II6 extending upwardly from the end walls18 of the frame member 15. It is also necessary to return the pivotedswinging arm 9| and trough 6 to their normal position. To accomplishthis the table 86 of the cam lever end extending into end of a smallshaft perforations II9, the plate I" being reinforced around saidperforations and each threaded to receive a threaded bushing I20.Theplate II8 I through the perforations I2l and through the f bushingsI20 and are connected together at their inner ends by means of acrosshead I24 that isheld in position by nuts I25. The rods I22 eachhave a shoulder for engaging a washer I26 that contacts one end of acompression spring I21 while the opposite end of that spring engages awasher I28 at one end of the bushing I20. Dis posed centrally betweenrods I22 and extending through the plates Ill and II 8 is a bufier whichis engaged on the return movement of the swinging arm 9I comprising atubular casing I29 for holding a compression spring I30 having a plugI3I with a perforation I32 secured to one end and a cap I33 at theopposite end for retaining a plunger I34 which is projected forward bythe spring I 30, The extending end-of thisplunger 63 and is pivoted on ashaft I38 to the main end 4 frame 64. The opposite end of each of theportionsto that supporting the track bar is bifurcated and perforated asat I39 to which is pivoted as at I40 an eye bolt I H having its shankextending through a slot in the stationary end frame 64 with washers I42and nuts I43 mounted thereon for clamping the end in a. fixed position.When the nuts I43 are unscrewed the hinged portions I31 can be swunginto the position indicated in dotted lines in Fig. 5.

In Figs. 1, 2, 23 and 24 we have shown means for indicating the lengthof pipe cut in which I44 is a dial mounted on a pedestal support I45having indicating scales graduated in feet as at I46 and inches as atI41 and provided with pointer hands I48 and I49 therefor respectively.The shorter hand I48 pointing to feet is secured to the outer end of atubular horizontally extending shaft I50 supported in a journal bearingI5I extending from the top portion of the pedestal support I45. and hasa. beveled gear I52 mounted on its opposite end which meshes with abeveled miter gear I53 which is secured toa vertically extending shaftI54 near the top portion. The longer hand I49 I55 mounted in the tubularshaft I50 and has a beveled miter gear I56 secured to its opposite endmeshing with abeveled gear I51 attached to the upper end of the shaftI54. naled in the pedestal support I45 and is coupled at its lower endas at I58 to a stub-shaft I59 journaled in a housing I60 and having aworm wheel I6I mounted thereon meshing with a worm is secured to theouter The vertically extending shaft I54 is jourof a sprocket chain It:to a sprocket wheel m The speed of the driving means is controlled tosuit the speed of the pipe I, through synchrotie generators and motors.

As the speed and stroke of the saw carriage 51 will vary with theadjustment of the pivotal end of the pitman rod 55 on the rocking lever3I, and the conj necting rod 38 having a relatively fixed pivotalconnection at 32 in relation to the rocking arm 3I it is necessary tocompensate for the variation during the cutting operation by having theopposite end of rod 38 pivoted on the eccentrically disposed portion 28of thestub-shaft 23. As indicated in Figs. 6 and '1 the pinion 22 on thestub- 'shaft 23 revolves in a circular path around the fixed gear 2| ina planetary manner with the crank or eccentrically disposedjportlon ofsaid stub-shaft traveling in an eccentric path as indicated in thediagram shown in Fig. 21. This will give a relative horizontal uniformspeed to the saw carriage 51 and saw 8| during the cutting operation asindicated in the central portion of the diagram shown in Fig. 22.

The pinion 22 revolves once around the fixed gear 2I for eachreciprocation of the saw carriage 81, at the same time the gearing inthe gear casing 8 rotates shafts H, 12 and 13 thereby rotating thecontrol segments I12, I13 and I14 of the limit switch 14 onerevolutionfor each reciprocation of the saw carriage 51 and the control for thesequence operation whichwill determine the number of revolutions of thepinion 22 per cut is indicated in Fig. 1'1. This diagram shows anarrangement that will accommodate any spacing from onerevolution toseven revolutions of the pinion 22 and control segments per cut,,andassuming that the contact arm for the cut selector is set on- No. 3position and the coils for the relays are deenergized and in theposition as indicated in the diagram, when control segment I12 makescontact with the fingers 11s it closes relays I18, m, m and us. A

holding circuit is established through coils I88 and NH, but currentdoes' not flow through the same until I12 breaks contact, at which timecoils I88 and I8I are energized, opening contacts I82 and I83 andclosing I84.

When control segment I12 makes contact with the contact .fingers I15 onthe second revolution, relays I85, I88 and I81 are closed with a holdingcircuit established through coils I88 and I89, but current does not flowuntil control segment I12 breaks contact at whichtime I88 and I89 areenergized thereby openingcontacts I98 and I9I and closing contact I92.Coils I88 and -I8I are deenergized, closing contacts I82 and I83 andopening contacts I84, I18, I11, I18 and I19. The functioning of segmentsI13 and I14 has no effect on this sequence.

When control segment I12 makes contact with the contact fingers I18 forthe third revolution, relays I93, I94 and I95 are closed therebyimmediately closing relays I98 and I91 for controlling the solenoid I88and opening relays I98 and I99. Relays I98 and I91 remain closed due tothe interlocking action of the control segment I13 which engages thecontact fingers 280 of the holding circuit. This closing of relays I98and I91 opens relays I85, I88, I81, I93, I94 and I95,

- thus resetting the control relays. Control segcloses and 284 and 285'are opened, and the holding circuit for I85, I88, I81, I88 and I89 isopened.

On the fourth revolution when control segment I12 makes contact with thefingers it closes relays 288, 281 and288. One side of the circuit ismade through contacts 283 and I94 and through 288, 281 and 288 coils .tobus bar line, and the holding circuit from the bus bar line throughrelay contacts I99 and I9I, coils I88 and I8I, contactor 288, coils 288,281 and 288 to the bus bar line. When coils I88 and I8I are energizedcontact 283 is opened through the interruption of the holding circuitfor I93, I94 and I95.

On the fifth revolution when the control segment I12 makes contact withthe fingers, it closes relays 289, 2I8 and 2I I. One side of the circuitis made through contacts 284, I98, I84, 281, coils ing circuit throughcontacts I99, 285, coils I88, I89 contact 289 and coils for 289, 2I8,and 2 to bus bar line.

are energized contacts I98 and I9I areopened and contact I92 is closedand interrupts the holding circuit for 288, 281 and 288. a

On the sixth revolution when the contact segment'I12 makes contact withthe fingers it closes relays 2I2, 2I3 and 2I4 and immediately closesrelays I98 and I91 which control the saw solenoid I88 and opens contactsof I98 and I99 relays.

Relays I98 and I91 remain closed through the interlocking action of theholding circuit and contact segment I13. The opening of relays I98 andI99 opens relays 289, 2I8, 2II, 2I2, 2I3 and 2, thus resetting thecontrol relays, and when contact segment I13 breaks contact it opensrelays I88 and I91 and allows I98 and I99 to close. After the cut ismade all the relays will be deenergized and will be in the positionindicated in Fig. 17, and the desired sequence can be repeated.

If a test piece is desired, the push button 2I5 is pressed and relays2I8 and 2H will be closed and stay closed through the action of theholding circuit as established by relay 2I8. If this occurs during thefirst revolution of a sequence when relays I18, I11, I18 and I19 areclosed, relays I98 and I91 will be closed by a circuit established fromthe bus bar line through contacts 2I8, I19

and I18 coils I91, I98, I99 and I98 to the bus bar line. This willactuate the saw cut solenoid I88 as described previously. 1

At the same time that this is occurring the interlocking anddisconnecting circuit for the test piece circuit is functioning. Afterthe closing of 2I8 and the resulting closing and interlocking of 2 I8and 2I1 and when contact segment I12 engages the contact fingers I15 'acircuit will be established from the bus bar line through When the coilsI88 and I89 a holding circuit for itself and 2I9 through its owncontact.

When contacts I96 and I 91 are closed contacts I98 and I99 will beopened deenergizing coils I18 and I19. However, contacts I98, I99, I96and I91 will be interlocked by contact segment I13 until after contactsegment I12 is opened and the test piece cut. When contact segments I13and I14 are opened contacts I96 and I91 will open and the short around 2I 9 will be withdrawn, allowing 2I9 to break the interlockingeircuit 2I6and 2I1. I When 2I6 opens the interlocking circuit of 2I8 and 2I9 willbe broken and-2I9 will close and r 2 I8 will open, thus restoring thetest piece circuit to normal.

In case push button 2I5 is closed after the first revolution, thesequence will continue to completion, and on the next revolution whencontact segment I12 engages the contact fingers-I15,

a test piece will be cut as previously described.

Relays 22I and 222 are also provided for a seventh revolution per cut.

With this manner of control after the saw gear casing 8 as shown in Fig.6 of the drawings.

The shaft of motor! is also connected by a train of gearing 9 to asynchro-tie generator I6 and a tachometer II which may be usedin'addition to the meter 253 for indicating the speed of the drivingmotor 5 at this point.

Mounted on a bracket secured to one end of the saw carriage frame 64 isthe limit switch 14 having the control segments I 12, I13 and I14 andcontact fingers I15, 209 and 228 mounted therein for the saw out controlcircuits. The motor 4 for adjusting the stroke of the rocking leverwheel I65 which is connected by means of a I sprocket chain I69 to asprocket wheel I18 for has made its'cut all the coils for the relayswill be deenergized and the be repeated. I

Referring now to Fig. 18 which is a view showing diagrammatically theelectrical circuits for controlling the operation of the drive for theflying saw, the positive and negative bus bars are indicated by thenumerals 223 and 224 respectively, 3 the mill motor, 4 the motor foradjusting the stroke of the swinging lever, and 5 the motor forreciprocating the saw carriage 51,

desired sequence can then each of which is provided with a circuit 225,226

and 221, respectively, extending to the bus bars 223 and 224. The millmotor 3 is connected by means of gearing 228 or the like to asynchro-tie generator 229 which isadapted to drive through the circuitconnection 238 a synchro-tie motor 23I which has a shaft for actuating amechanical differential 232 provided with a regulator 233.

to adjust the speed of the driving motor 5 and a cone pulley 234 whichis connected by means of a belt 235 to the cone pulley 236, having ashaft 231 rotated by means of a synchro-tie motor 238 having a circuitconnection 239 extending to the synchro-tie generator III for the motor5. For adjusting the speed of the driving motor 5 to compensate forvarious saw radii the belt 235 connecting the cone pulleys 234 and 236is pro vided with a threaded belt shift 240 which is adjusted by meansof a threaded rod 24I adapted to be rotated by means of-a synchro-tiemotor 242, having a circuit 243 extending to a synchrotie motor 244.These two synchro-tie motors 242 and 244 receive their power from thesynchrotie generator I68 driven by the motor 4 for adlusting the strokeof the rocking lever 3|, through the circuit 245.

In order to provide for vernier adjustment of the pulleys 234 and 236and the saw stroke, the synchro-tie motor 244 has a shaft 246 connec edby means of a train of gearing 241 with the shaft of the motor 248having a circuit conne"tion 249 extending to the bus bars 223 and 224.Said motor 248 is also provided with a brake 250 for controlling thesame.

The motor 5 for reciprocating the sawcarriage has its shaft provided atone end with a D. C. magneto generator 25I having a circuit connect on252 extending .to a voltmeter 253 calibrated for indicating the gearmotor speed.

The opposite end of the shaft for the driving motor 5 is connected toreduction gearing in the actuating a limit switch I1I'for controlling adial indicator, the operation of which will be more clearly understoodby referring to the diagram shown in Fig. 20. In this diagramillustrated in Fig. 20 there is shown the indicating dial 254 with anarrangement to preset the length of pipe to be cut. This dial has ascale 255 which reads in inches corresponding to the length of thetravel of the. pivotal point upon the rocking lever 3I which controlsthe stroke of the saw carriage. This dial is driven through a ynchro-tieconnection to .the rocking lever stroke adjusting motor 4 comprisingchain and sprocket connections, synchro-tie generator I68, circuitconnection 256, synchro-tie motor 251 and shaft 258 provided with abeveled gear 259 meshin with a beveled gear 266 which engages theperiphery of the dial 254.

Pivoted centrally on the dial 254 is a contact arm 26I having a pointer262, which can be moved to any predetermined value desired upon thescale 255, depending upon the length of pipe to be cut, by means of anadjusting knob 263. With this. device the operator while rolling aschedule of pipe of a the next length of pipe to be cut and will movethe contact arm 26I to avalue on the scale 255 this, assume that theoperator by means of the v adjusting knob 263 moves the contact arm, 26Ito the right, which would permit cutting a longer length of pipe than isbeing cut at the time this .change is'being made. Nothing will happenun-1 til the double throw switch 264 which is marked manual at the top andautomatic at the bottom is thrown to the bottom. When this is done theleft-hand blade of the switch 264 shown in Fig. 20 will be active andwill close the circuit to the operating coils 265 and 266 marked long"in the diagram. The circuit will be from the left-hand bus bar throughcoils 265 and 266 marked long and then back to the revolving,

segment 261, contact arm 26I, middle stud of knob 263 of dial 254 andthen 'back to the opposite side of the control bus bar. This will startmotor 4 in the direction to increase the length or radius of the rockinglever arm and by means of the synchro-tie equipment the dial 254 willrotate until its automatic position corresponds to the preset positionof the contact arm 26I at which time the motor 4 will stop.

If the operator desires to cut a shorter length given length willdetermine of pipe he moves which will permit pipe than is "sho tor 4 tochange 11 the contact arm 23I to the left cutting a shorter length ofbeing out at the time this change is When the switch 284 is thrown intobeing made.

position, the right-hand blade the "automatic of said switch will beactive and will close the f circuit to the operating coils 268 and 269marked short." The circuit will then be from the lefthand bus barthrough coils 268 and 269 marked and then back to the revolving segment210, contact arm 26I, middle stud or knob 233 1 of dial 264, and thenback to the right-hand bus bar. This will start motor 4 in the reversedirection to that above described and will decrease the length. orradius of the rocking lever and by 1 means of the synchro-tie equipment,the dial 254' will rotate until its ofl position corresponds to thepreset position of the contact arm 26I at which time the motor 4 willstop.

If for any reason it is desirable to inch the mothe radius of therocking lever arm, the switch 264 can be movedto the upper positionmarked "manua after. which the motor' 4 can be moved in one direction orthe other depending upon which Way the .vertical handle 21I of themaster switch 212 is moved. It will be noted that on long and on therighthand side short. The switch 264 is a standard double-pole type ofcontrol switch and is adapted for the operator to hold it in positionuntil the desired movement is completed and then return it to the oflposition.

If there is any over-travel the said two-pole switch 264 will cause themotor 4 to start in the reverse direction to-come back to position.

In Fig; 19 is shown a device that will indicate the travel of the pipein feet per minute, and a corresponding instrument that will becalibrated on a similar scale that is operated by a magneto theleft-hand side the master .switch 212 is marked to the rockinglever arm,3I has an adjustable block 31 mounted therein with a pitman 65 havingone end pivoted thereto for adjustment and its opposite end pivoted tothe reciprocating saw carriage in a relatively fixed position.

Keyed to the tubular shaft I4 in the gear casing 8 is a beveled gear 66meshing with a similar beveled gear 61 on shaft 63 connected bycouplings-to the longitudinally extending shaft 1I,

cam shaft '12, and a shaft 13 extending-to the limit switch 14 havingthe segment contacts I12, I13 and I14 mounted therein for controllin thesaw cut.

As the cut selector i set on No. ,3, during the first two reciprocationsof the saw carriage 51 the parts will remain in the position indicatedin dotted lines in Fig. 5. 0n the third reciprocation of the sawcarriage 61 the limit switch 14 will close the circuit to energize thesolenoid I00 thereby disengaging the latch 91 from the pawl 96 allowingthe spring I I3 to raise the cam lever 85, until it engages the stop'lI5. This will bring the cam 89 into the path of the cam roller 90 toswing the pivoted arm 9| and movable trough 6 and pipe I into the fullline position to cut the pipe as indicated in Fig. 5. After the'pipe Ihas been cut and the solenoid I09 deerrergized, the cam 95 engaging thecam roller 94 will again return the cam lever 85 to the dotted lineposition and the spring I05 will actuate the latch 91 to engage the pawl96 to hold' the parts in this posigenerator on the motor '4 that rotatesthe rock- This consists of a pinch roll 213 the traveling pipe I whiching lever arm. which contacts with drives a D. C. magneto generator 214to which is connected a voltmeter 215 calibrated in feet per minute. Asimilar instrument 253 is connected to the magneto generator 25I drivenby the motor 6.

Having thus given the foregoing general and detailed description of our.invention, we will now further describe the operation of the same.Assuming that the cut selector is set on No, 3 position as indicated inFig. 11 the pipe I after leaving the welding and sizing rolls 2 isadvanced through the channel or stationary trough 216 into the movabletrough 6 adjacent to the continuously reciprocating saw carriage 51having a continuously rotating saw 6 I.mounted thereon. The saw carriageis provided with rollers 62 for engaging track bars 63 secured to thestationary end frames 64 for guiding and supporting the same. I

The saw carriage 51 is reciprocated by means of a motor 5 through shaft1, worm I2 and worm wheel I3 which is keyed to a rotating tubular shaft14 journaled in bearings in the gear castion'unt-il the solenoid isagain energized to re peat the operation.

The spring I21 will also return the pivoted swingi g arm 9| and movabletrough 6 to the dotted line position.

Although we have shown and described our invention in considerabledetail, we do not wish to be limited to the exact construction shown anddescribedbut may use such substitutions, modifications or equivalentsthereof, as are embraced within the scope of our invention, or aspointed out in the claims.

Having thus described our invention, what. we

claim as new and desire to secure by Letters Patent is:

1. A machine for severing continuously moving pipe or the like intolengths, comprising a stationary frame, spaced track bars securedthereto, a, carriage mounted to reciprocate between the track bars,means for reciprocating ing 8. The tubular shaft I4 has an enlargedextending cup shaped portion 26 witha-cover 21 in which is journaled thestub shaft 23 having a pinion 22 mounted thereon adapted to revolve in aconcentric planetary path around a fixed gear 2|. The stub shaft 23 hasa crank arm 23 or eccentrically disposed extending portion for pivotingone endof a connecting rod 30-having its opposite end pivoted in arelatively fixed position the carriage, a continuously rotating sawmounted on the, carriage, a guide for supporting the moving pipeattached to a swinging arm pivotally mounted on the carriage, a cam whenon the swinging arm, a cam lever journaled at one end in a stationaryframe, member adjacent to the carriage, a cam secured to the opposite.end of the cam lever, a pawl extending from the cam lever, a resilientlyactuated latch for engaging the pawl for normally holding the cam out ofthe path of the cam roller during the reciprocation of the carriage,electromagnetically controlled means for releasing the latch, resilientmeans for swinging the cam into the path of the cam roller for tiltingthe pipe into cutting engagement with the saw during a reciprocation ofthe carriage, astop for limiting the swinging movement of the cam lever, cam actuated means for returning the cam lever arm 3|. This rockinglever guide to project the

